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# Calculate vibration induced sound (noise)

## Calculate vibration induced sound (noise)

(OP)
Hi All

Re-posted to include the Subject line. Missed it the first time. Sorry for the repetition.

Can someone please point me to a reliable (and hopefully simple) calculation method for predicting vibration induced noise. For example, I would like to calculate the sound levels below a floor, say 10 inches of PT concrete, with a known excitation from a pump or chiller operating with, and withpout, spring mounts. Of course, we can calculate the difference between those two conditions based on the spring transmissibility curve. How about calculating the actual sound levels for a comparison to codes or other standards? Do we need to do this in comsol or other FEA method, or is there a simpler way?

Any tested/measured example cases out there?

Thanks!

### RE: Calculate vibration induced sound (noise)

Yes, it is possible to calculate the sound intensity from a panel with a known vibration. It is not, in general, a simple exercise.

The problem is that the speed of the surface waves in the panel have a strong effect on the radiated noise, due to cancellation.

This is the outline of the method that I have used in the past

https://saemobilus.sae.org/content/750832

That rather avoids the difficulty of estimating the vibration in the first place, we were using measured vibration levels and trying to come up with an overall soundpower, with a contribution from each panel.

Cheers

Greg Locock

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### RE: Calculate vibration induced sound (noise)

(OP)
Thank you!

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